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Richard Brice
4374c81981
* Honour IfcAxis2PlacementLinear Axis/RefDirection in the loft builder make_loft() (src/ifcgeom/infra_sweep_helper.cpp), shared by IfcSectionedSolidHorizontal and IfcSectionedSurface, mishandled a cross section's IfcAxis2PlacementLinear in two ways: 1. A placement carrying Axis but no RefDirection was placed with a fixed [e_y | e_z | e_x] world-axis permutation that ignored the directrix. On any directrix not running along +X (e.g. a north-south road pavement, or anywhere along a curve) the profile came out mis-oriented or collapsed to a sliver. 2. When two adjacent CrossSectionPositions used direction vectors inconsistently (a raked RefDirection at one, a plain Axis at the other) make_loft() logged GEO 42, dropped the rotation for the whole segment and squared every cap -- and in one configuration left the sweep frame flipped, so OpenCASCADE failed to build the solid at all. Now a small profile_basis() helper builds every cross section's frame the same way: profile Y = Axis, profile normal = RefDirection, and -- when RefDirection is absent -- profile normal = the directrix tangent, so the section stays perpendicular to the path (buildingSMART IFC4.x-IF #147). When the two bracketing placements ask for the same orientation the sweep frame carries it, built against the curve. When they disagree the sweep frame stays on the shared Axis (continuous with the neighbouring consistent segments, so nothing flips) and each end's own authored orientation is folded into its profile points via a change of basis, so each end cap still lands exactly as authored while the body in between keeps following the directrix. The all-equal and no-direction-vector paths are unchanged. The two mappings now also carry the raw RefDirection through on cross_section, alongside the existing rotation matrix. Adds C++ tests (a raked end logs no GEO 42; a directrix that does not run along +X still lofts a full-size solid) and Python tests (uniform prism raked at one end and square at the other; a north-south directrix keeps its width; OffsetLateral/OffsetVertical are scaled by the model length unit). * Renames profile_rotations to profile_axis for consistency with profile_ref_directions
IfcOpenShell
IfcOpenShell is an open source (LGPL) software library for working with Industry Foundation Classes (IFC). Complete parsing support is provided for IFC2x3 TC1, IFC4 Add2 TC1, IFC4x1, IFC4x2, and IFC4x3 Add2. Extensive geometric support is implemented for the IFC releases IFC2x3 TC1 and IFC4 Add2 TC1. Extending with support for arbitrary IFC schemas is possible at compile-time when using C++ and at run-time when using Python.
In addition to a C++ and Python API, IfcOpenShell comes with an ecosystem of tools, notably including IfcConvert (an application to convert IFC models to other formats), Bonsai (an add-on to Blender providing a graphical IFC authoring platform), and many other libraries, CLI apps, and more. Support is also provided for auxiliary standards such as BCF and IDS.
For more information, see:
Development is sponsored through your generous donations!
Contents
| Name | Description | License | Service |
|---|---|---|---|
| bcf | Library to read and write BCF-XML and query OpenCDE BCF-API modules | LGPL-3.0-or-later |   |
| bonsai | Add-on to Blender providing a graphical native IFC authoring platform | GPL-3.0-or-later |    |
| bsdd | Library to query the bSDD API | LGPL-3.0-or-later |  |
| ifc2ca | Utility to convert IFC structural analysis models to Code_Aster | LGPL-3.0-or-later | |
| ifc4d | Convert to and from IFC and project management software | LGPL-3.0-or-later |  |
| ifc5d | Report and optimise cost information from IFC | LGPL-3.0-or-later |  |
| ifcbimtester | Wrapper for Gherkin based unit testing for IFC models | LGPL-3.0-or-later | |
| ifcblender | Historic Blender IFC import add-on | LGPL-3.0-or-later* | |
| ifccityjson | Convert CityJSON to IFC | LGPL-3.0-or-later |  |
| ifcclash | Clash detection library and CLI app | LGPL-3.0-or-later |  |
| ifcconvert | CLI app to convert IFC to many other formats | LGPL-3.0-or-later* |   |
| ifccsv | Library and CLI app to export and import schedules from IFC | LGPL-3.0-or-later |  |
| ifcdiff | Compare changes between IFC models | LGPL-3.0-or-later |  |
| ifcedit | CLI wrapper for ifcopenshell.api IFC model mutation functions | LGPL-3.0-or-later |  |
| ifcfm | Extract IFC data for FM handover requirements | LGPL-3.0-or-later |  |
| ifcmax | Historic extension for IFC support in 3DS Max | LGPL-3.0-or-later* | |
| ifcmcp | MCP server for querying and editing IFC building models | LGPL-3.0-or-later |  |
| ifcopenshell-python | Python library for IFC manipulation | LGPL-3.0-or-later* |         |
| ifcpatch | Utility to run pre-packaged scripts to manipulate IFCs | LGPL-3.0-or-later |  |
| ifcquery | CLI tool for querying and inspecting IFC building models | LGPL-3.0-or-later |  |
| ifcsverchok | Blender Add-on for visual node programming with IFC | GPL-3.0-or-later |  |
| ifctester | Library, CLI and webapp for IDS model auditing | LGPL-3.0-or-later |  |
The IfcOpenShell C++ codebase is split into multiple interal libraries:
| Name | Description | License |
|---|---|---|
| ifcgeom | Internal library for IfcOpenShell | LGPL-3.0-or-later* |
| ifcgeom_schema_agnostic | Internal library for IfcOpenShell | LGPL-3.0-or-later* |
| ifcgeomserver | Internal library for IfcOpenShell | LGPL-3.0-or-later* |
| ifcjni | Internal library for IfcOpenShell | LGPL-3.0-or-later* |
| ifcparse | Internal library for IfcOpenShell | LGPL-3.0-or-later* |
| ifcwrap | Internal library for IfcOpenShell | LGPL-3.0-or-later* |
| serializers | Internal library for IfcOpenShell | LGPL-3.0-or-later* |